Me, on the phone with my husband.
Me: “Say, hypothetically speaking, you went to the store and bought a “26” printer cartridge because you thought that was the right one, but then you got home and you discovered that you actually need a “56” printer cartridge. Could you just go ahead and use the “26” anyway?”
My husband: “Uh, n-o-o-o. They put those numbers there for a reason!”